76 results found
Christoforidis KC, Syrgiannis Z, La Parola V, et al., 2018, Metal-free dual-phase full organic carbon nanotubes/g-C<inf>3</inf>N<inf>4</inf>heteroarchitectures for photocatalytic hydrogen production, Nano Energy, Vol: 50, Pages: 468-478, ISSN: 2211-2855
© 2018 Hydrogen generation from water using solar energy has grown into a promising approach for sustainable energy production. Over the last years, graphitic carbon nitrides (g-C3N4, CN), polymers based on the heptazine-group, have been widely applied as photocatalysts for H2evolution. The poor charge separation efficiency of CN is considered the major drawback. Here, we investigated the effect of coupling CN with different types of carbon nanotubes on the charge transfer properties and the photocatalytic H2evolution. We used carbon nanotubes (CNTs) of different wall number (single (SWCNTs), double (DWCNTs) and multi-walled (MWCNTs) CNTs) for the development of full-organic CN based composite photocatalysts. Photoactivity was drastically affected by the content but more importantly by the nature of the CNTs. The SWCNTs functionalized CN composites were the most active presenting approximately 2–5 times higher H2evolution than the corresponding DWCNTs and MWCNTs functionalized CN under both solar and pure visible light irradiation. Photoactivity was primarily controlled by the improved electronic properties linked with the abundance and stability of photogenerated charges as evidenced by electron paramagnetic resonance spectroscopy. Transient absorption spectroscopy verified the transfer of reactive electrons from CN to CNTs. CNTs functioned as electron acceptors improving charge separation. The data suggest that charge transfer is inversely proportional to the wall number of the CNTs and that photoactivity is directly controlled by the size at the nanoscale of the CNTs used. In the CNTs/CN nanocomposites, photogenerated electrons are transferred more efficiently from CN when SWCNTs are used, providing more available electrons for H2production.
Evans A, Luebke R, Petit C, 2018, The use of metal-organic frameworks for CO purification, Journal of Materials Chemistry A, Vol: 6, Pages: 10570-10594, ISSN: 2050-7488
© 2018 The Royal Society of Chemistry. Carbon monoxide (CO) represents a key feedstock in the petrochemical industry and must be produced in sufficient purity for industrial use. Such requirement imposes strict performance targets on separation technologies and processes employed to purify CO. An important consideration, adding further difficulty to this separation, is the chemical complexity of some CO-containing streams which include gas molecules such as H2, CO2, N2, H2O. While processes such as cryogenic distillation and/or absorption can be applied, the associated high-energy consumption and/or poor stability of the absorption solvents remain key barriers and considerations in large-scale deployment. In this review, we provide an up-to-date account of the literature on adsorption technologies for CO purification with particular emphasis on the use of metal-organic frameworks (MOFs). We highlight key chemical and structural features of MOFs which govern the adsorption mechanisms as well as the resulting performance metrics (e.g. uptake and selectivity). We discuss important aspects of technology scale-up including sorbent robustness, manufacturability and performance under 'real' conditions. A comparison of literature reported adsorbents, tested for CO adsorption, including a benchmark material is provided. Based on our analysis of the field, we present an outlook of future challenges as well as opportunities for future research in this area.
Papoulis D, Panagiotaras D, Tsigrou P, et al., 2018, Halloysite and sepiolite –TiO<inf>2</inf>nanocomposites: Synthesis characterization and photocatalytic activity in three aquatic wastes, Materials Science in Semiconductor Processing, Vol: 85, Pages: 1-8, ISSN: 1369-8001
© 2018 Elsevier Ltd Two different nanoclay minerals were combined with nanophase anatase TiO2for the synthesis of clay-based nanocomposites for improved photocatalytic properties. A new Halloysite (Hal) + Sepiolite (S) - TiO2ternary nanocomposite was prepared using halloysite from Utah, USA and a recently discovered sepiolite from Greece. Three nanocomposites were synthesized with Hal-TiO2, S-TiO2and [Hal+S] to TiO2. As a result, TiO2particles (anatase) were homogeneously deposited and dispersed on the clay surfaces. Phase composition, particle morphology and physical properties of these nanocomposites were characterized by XRD, ATR-FTIR, FE-SEM, DRS-UV–Vis and N2-sorption/desorption isotherms at 77 K. The photocatalytic activity of the clay mineral-TiO2nanocomposites was examined in the decomposition of paracetamol and tetracycline antibiotics as well as dye Rhodamine-B. The nanocomposites exhibited higher photocatalytic activity under UV irradiation for the decomposition of the targeted pollutants than the benchmark in the field, i.e. TiO2- P25 photocatalyst.
Petit C, 2018, Present and future of MOF research in the field of adsorption and molecular separation, Current Opinion in Chemical Engineering, Vol: 20, Pages: 132-142
© 2018 Elsevier Ltd It is a critical and exciting time for research on adsorption using metal–organic frameworks (MOFs) as we witness the commercial release of the MOF-based products TruPick and ION-X, two MOF-based products with application in the food packaging and electronic gas delivery platform sectors, respectively. Such milestones call for reflection on the outputs of MOF research in the field of adsorption so far and the challenges and opportunities lying ahead. To this end, this review provides a snapshot of current trends in this research space (i.e. new adsorption application, manufacturing, role of modeling), highlights the most promising structures for given applications (i.e. in gas adsorption, gas storage, molecular separation, water purification and harvesting), points to technical barriers, and exposes a vision for future research in this area.
Stafford J, Patapas A, Uzo N, et al., 2018, Towards scale-up of graphene production via nonoxidizing liquid exfoliation methods, AIChE Journal, ISSN: 0001-1541
© 2018 American Institute of Chemical Engineers. Graphene, the two-dimensional form of carbon, has received a great deal of attention across academia and industry due to its extraordinary electrical, mechanical, thermal, chemical, and optical properties. In view of the potential impact of graphene on numerous and diverse applications in electronics, novel materials, energy, transport, and healthcare, large-scale graphene production is a challenge that must be addressed. In the past decade, top-down production has demonstrated high potential for scale-up. This review features the recent progress made in top-down production methods that have been proposed for the manufacturing of graphene-based products. Fabrication methods such as liquid-phase mechanical, chemical and electrochemical exfoliation of graphite are outlined, with a particular focus on nonoxidizing routes for graphene production. Analysis of exfoliation mechanisms, solvent considerations, key advantages and issues, and important production characteristics including production rate and yield, where applicable, are outlined. Future challenges and opportunities in graphene production are also highlighted.
Crake A, Christoforidis KC, Kafizas A, et al., 2017, CO2 capture and photocatalytic reduction using bifunctional TiO2/MOF nanocomposites under UV-vis irradiation, APPLIED CATALYSIS B-ENVIRONMENTAL, Vol: 210, Pages: 131-140, ISSN: 0926-3373
Leeson D, Fennell P, Shah N, et al., 2017, A Techno-economic analysis and systematic review of carbon capture and storage (CCS) applied to the iron and steel, cement, oil refining and pulp and paper industries., 13th International Conference on Greenhouse Gas Control Technologies (GHGT), Publisher: ELSEVIER SCIENCE BV, Pages: 6297-6302, ISSN: 1876-6102
Leeson D, Mac Dowell N, Shah N, et al., 2017, A Techno-economic analysis and systematic review of carbon capture and storage (CCS) applied to the iron and steel, cement, oil refining and pulp and paper industries, as well as other high purity sources, INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, Vol: 61, Pages: 71-84, ISSN: 1750-5836
Marchesini S, McGilvery CM, Bailey J, et al., 2017, Template-Free Synthesis of Highly Porous Boron Nitride: Insights into Pore Network Design and Impact on Gas Sorption, ACS NANO, Vol: 11, Pages: 10003-10011, ISSN: 1936-0851
Marchesini S, Regoutz A, Payne D, et al., 2017, Tunable porous boron nitride: Investigating its formation and its application for gas adsorption, MICROPOROUS AND MESOPOROUS MATERIALS, Vol: 243, Pages: 154-163, ISSN: 1387-1811
Woodward RT, Jobbe-Duval A, Marchesini S, et al., 2017, Hypercrosslinked polyHIPEs as precursors to designable, hierarchically porous carbon foams, POLYMER, Vol: 115, Pages: 146-153, ISSN: 0032-3861
Dias EM, Petit C, 2016, Towards the use of metal-organic frameworks for water reuse: a review of the recent advances in the field of organic pollutants removal and degradation and the next steps in the field (vol 3, pg 22484, 2015), JOURNAL OF MATERIALS CHEMISTRY A, Vol: 4, Pages: 3565-3565, ISSN: 2050-7488
Hong J, Chen C, Bedoya FE, et al., 2016, Carbon nitride nanosheet/metal-organic framework nanocomposites with synergistic photocatalytic activities, CATALYSIS SCIENCE & TECHNOLOGY, Vol: 6, Pages: 5042-5051, ISSN: 2044-4753
Smit B, Graham R, Styring P, et al., 2016, CCS - A technology for the future: general discussion, FARADAY DISCUSSIONS, Vol: 192, Pages: 303-335, ISSN: 1359-6640
Wang J, Petit C, Zhang X, et al., 2016, Phase Equilibrium Study of the AlCl3-CaCl2-H2O System for the Production of Aluminum Chloride Hexahydrate from Ca-Rich Flue Ash, JOURNAL OF CHEMICAL AND ENGINEERING DATA, Vol: 61, Pages: 359-369, ISSN: 0021-9568
Woodward RT, Fam DWH, Anthony DB, et al., 2016, Hierarchically porous carbon foams from pickering high internal phase emulsions, CARBON, Vol: 101, Pages: 253-260, ISSN: 0008-6223
Dias EM, Petit C, 2015, Towards the use of metal-organic frameworks for water reuse: a review of the recent advances in the field of organic pollutants removal and degradation and the next steps in the field, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 3, Pages: 22484-22506, ISSN: 2050-7488
Lin K-YA, Yang H, Petit C, et al., 2015, Removal of oil droplets from water using carbonized rice husk: enhancement by surface modification using polyethylenimine, ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, Vol: 22, Pages: 8316-8328, ISSN: 0944-1344
Lin K-YA, Yang H, Petit C, et al., 2015, Magnetically controllable Pickering emulsion prepared by a reduced graphene oxide-iron oxide composite, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 438, Pages: 296-305, ISSN: 0021-9797
Park A-H, Gao M, Petit C, 2015, Chemical and physical characterizations of liquid-like nanoparticle organic hybrid materials (NOHMs) designed for CO2 capture and conversion, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Park Y, Lin K-YA, Park A-HA, et al., 2015, Recent advances in anhydrous solvents for CO2 capture: ionic liquids, switchable solvents, and nanoparticle organic hybrid materials, FRONTIERS IN ENERGY RESEARCH, ISSN: 2296-598X
Petit C, Bandosz TJ, 2015, Engineering the surface of a new class of adsorbents: Metal-organic framework/graphite oxide composites, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 447, Pages: 139-151, ISSN: 0021-9797
Wang J, Li Z, Park A-HA, et al., 2015, Thermodynamic and kinetic studies of the MgCl2-NH4Cl-NH3-H2O system for the production of high purity MgO from calcined low-grade magnesite, AICHE JOURNAL, Vol: 61, Pages: 1933-1946, ISSN: 0001-1541
Lin K-YA, Park Y, Petit C, et al., 2014, Thermal stability, swelling behavior and CO2 absorption properties of Nanoscale Ionic Materials (NIMs), RSC ADVANCES, Vol: 4, Pages: 65195-65204, ISSN: 2046-2069
Lin K-YA, Yang H, Petit C, et al., 2014, Removing oil droplets from water using a copper-based metal organic frameworks, CHEMICAL ENGINEERING JOURNAL, Vol: 249, Pages: 293-301, ISSN: 1385-8947
Park Y, Petit C, Han P, et al., 2014, Effect of canopy structures and their steric interactions on CO2 sorption behavior of liquid-like nanoparticle organic hybrid materials, RSC ADVANCES, Vol: 4, Pages: 8723-8726, ISSN: 2046-2069
Petit C, Park A-HA, 2014, Designing the next generation of CO2 capture solvents: Nanoparticle organic hybrid materials (NOHMs), 247th National Spring Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Petit C, Park A-HA, 2014, Novel liquid-like nanoparticle organic hybrid materials for CO2 captrue and conversion, 248th National Meeting of the American-Chemical-Society (ACS), Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
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